Hydraulic hoist for ladders



Sept. 1, 1953 K. E. CHESNEY ETAL HYDRAULIC HOIST FOR LADDERS Filed July 10, 1950 Keith E. Chesney Mam E. Chesney INVENTORS Patented Sept. l, 1953 2,650,750 HYDRAULIC HOIST FOR LADDERS Keith E. Chesney and Fruitland, Idaho Application July 10, 1950, Serial No. 172320 10 Claims.

Conveniently, the hoist comprises a, pair of disposed members 20 which Mel-tie E. Chesney,

are of hollow or tubular open at their upper and disposed pa't'tions terior of the members 20 into or socket 24 and a The two members A pair of support legs 30, rigdly attached to each other intermediate their ends upper extremities, which are sldably receivable These pistons through the lines 48 into the pressure chambers 26 will move the support leg assembly outwardly of the members 20 and thus relatively extend the distance between the outer ends of the support legs and the anchor members AO at the other end of the ladder. Thus, the extending of the ladder assembly will securely wedge the same by means of the anchor members 52 and the support legs 30 into asfr'm and rigidly held` position, whereby the easeand safety of use of 'the ladder will be a greatly enhanced, and the ladder may be securely held as for scaffolding and the like.

By manipulating the control lnob.45,; the control valve, not shown, will be so operated as to permit the return of the pressurefluidfrom the' chambers 28 back into the reservoir 44, thereby permitting the leg assembly to becollapsed into the members 29 to permit removal of the ladder.

As will be readily understood, the braces 28 and 32 are so positioned as to constitute suppletions and changes will readily occur to those i skilled in--the art after a, consideration of the foregoing specification andaccompanying drawings, itis -not desired to limit the invention to the exact-Construction shown and described, but all suitable 'modifications and equivalents may be resorted to, falling with'n the scope of the appended claims.

Having described the invention, what is claimed as .newis i. A adder attachment comprising a base, a w

pair of spaced seat members mounted on said base and havingmeans for receiving and supporting the ends' of a pair of ladder rails, a pair of support legs mounted on said base and extencling on the opposite side thereof from said seat members, a hydraulic hoist for causing sliding movement between said seat members and` said support legs, and a control vaive for said hoist. 2.; A ladder attachment comprising a base, a pair of spaced seat members mountedon said base and having means for receiving and supporting the-ends of a pair of ladder rails, a pair ot support legs mounted on said base and extending on the' opposite side thereof from said seat members, a hydraulic hoist for causing sliding movementbetween said seat members and said support legs, a control valve for said hoist, a lateral ,brace rigidly connecting said seat members.

3. A ladder attachment comprising a base, a pair of spaced seat members mounted on said base and having means for receiving and supporting the ends of a pair of ladder rails, a pair of support legs mounted on said base and extending on the opposite side thereor' from said seat members, a-h movement between said seat members and said support legs, a valve controlling said hoist, a lateral brace rigidly connecting said seat members, said brace being parallel to the ladder rungs and having the same space from the adjacent ladder rung to form a continuation of said rungs.

4., A ladder hoist comprising a base, a pair of spaced seat members mounted on said base and having means for receiving and supporting the .4 ends of a, pair of ladder rails, a pair of support legs mounted on said base and extending on the opposite side thereof from said seat members, hydraulic means for extending said support legs with respect to said seat members, a lateral brace connecting said support legs, a control valve for said hydraulic means.

5. A ladder hoist comprising -a base, a pair ot spaced seat members mountedon said base and having'means for receiving' and supporting the ends of a, pair of ladder rails, a pair of support legs mounted on said base and extending on the opposite side thereof from said seat members, hydrauli'c means for causing sliding movement betweensaidseat members and said support legs, a valve controlling said hydraulic means, lateral braces respectively rigidly connecting said seating members and said support legs, said braces comprising supplemental rungs at one end of a ladder, anchoring means at the other ends of said ladder rails, said sliding movement pressing said anchoring means into anchoring position.

6. A ladder hoist comprising a base, a pair of spaced seat members mounted on said base and having means for receiving and supporting the ends of a pair of. ladder rals, a pair o support legs mounted on said base and extending on. the opposite side' thereof from said: seat members, said base having fluid pressure cylinders, said support legs having pstons-slidable in said .oylinders, means for supplying fluid pressure to said cylinders for causing sliding movement between said seat members and said. supportlegs to extendthe support legs with respect to said base, and a valve for releasing .the fluid pressure from said cylinders,

7. A ladder hoist comprsng a pair of parallel cylinders, a socket mounted on .the upper ,end oi each cyiinder for receving and supporting a ladder rail therein, each cylinder below said socket having a chamber, a support leg slidable in each chamber and extending-below said cylinders, a plate extending between said cylinders and closing the lower chambers and retaining said support legs therein, means for iorcing fluid into said chamber for causing sliding movement-of said-support legs in said chambers, and a fluid release valve for said cylinders.

8. A ladder hoist comprising a pair of parallei cylinders, a socket rigidly mounted. on` the upper end of each cylinder for receiving and supporting a ladder rail therein,. each cylinder below said socket having a chamber, asupport ieg slidablen each chamber and extending be low said cylinders, a plate extending between said cylinders and closin the lower chambers and retaining said support legs therein, a fluid pressure pump mounted on said plate and operatively'connected to said chambers for delivering fluid into said chambers for causing sliding movement of said support legs n said chambers, and a valve for reiieving the fluid pressure in said cylinders.-

9. A ladder hoist comprising a pair of parallel cylinders, a socket integral with the upper end of each cyiinder or receiving and supporting a ladder rail therein,. each cyiinder below said socket having a chamber, a support leg slidable in each chamber and extending below said cylinders, a plate extending between said cylinders and ciosing the lower chambers and retaining said support legs therein, means for delivering fluid under pressure into said chambers for causing reciprocating movement of said support legs in said chambers, a fluid release 6 vaIVe for releasing the fluid pressure in said a control valve oontrolling the return flow of cylinders, braces respectively r'gdly connectfluid from said cylnders to said reservo'r.

ng said sockets and said support legs and form- KEITH E. CHESNEY.

ing supplemental rungs for a ladder. MERTIE' E. CHESNEY.

1 A ladder having side ra'ls and rungs se- 5 cured therebetween, a ladder ho'st comprsng Re erences Cited i h fi of this p te t UNITED STATES PATENTS fiu'd cylinders on the oppos'te sdes of said base Nov 2 from said members, pistons slidable in said cy1in- 10 1 8,336 stage Jun'e 1922 ders, support legs mounted on said pstons and 1 fl 1925 extend'ng beyond said cylinders, a plate exten 2127 ()35 Kirln Aug. 16 1 3 ing between seid cyl'nders and retaning said 2:183:679 mms 1939 pistons ther-ein, a fluid reservor, connectons from said reservo'r to said cyhnders and pump 15 FOREIGN PATENTS means for forc'ng fluid from said reservoir into Number Country Date said cyl'nders for extendng said support legs, 7,879 Great Britain Apr. 5, 1904 

